CN103545485B - The method of preparing a lithium ion battery electrode - Google Patents

The method of preparing a lithium ion battery electrode Download PDF

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CN103545485B
CN103545485B CN201210242386.8A CN201210242386A CN103545485B CN 103545485 B CN103545485 B CN 103545485B CN 201210242386 A CN201210242386 A CN 201210242386A CN 103545485 B CN103545485 B CN 103545485B
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method
surface
preparing
support structure
ion battery
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CN201210242386.8A
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CN103545485A (en
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王佳平
姜开利
范守善
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清华大学
鸿富锦精密工业(深圳)有限公司
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of or comprising active material
    • H01M4/13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139Processes of manufacture
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of or comprising active material
    • H01M4/62Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624Electric conductive fillers
    • H01M4/625Carbon or graphite
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of or comprising active material
    • H01M4/64Carriers or collectors
    • H01M4/66Selection of materials
    • H01M4/663Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation
    • Y02E60/122Lithium-ion batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/54Manufacturing of lithium-ion, lead-acid or alkaline secondary batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/49108Electric battery cell making
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/49108Electric battery cell making
    • Y10T29/49115Electric battery cell making including coating or impregnating

Abstract

本发明涉及一种锂离子电池电极的制备方法,该方法包括以下步骤:提供一支撑体,该支撑体具有一第一表面;提供至少一石墨烯膜,该石墨烯膜设置或形成于所述支撑体的第一表面;以及,在所述石墨烯膜的表面设置一电极材料层。 The present invention relates to a method for preparing a lithium ion battery electrode, the method comprising the steps of: providing a support member, the support member having a first surface; providing at least one graphene layer, the graphene film disposed or formed on the a first surface of the support; and an electrode material layer provided on a surface of the graphene film.

Description

锂离子电池电极的制备方法 The method of preparing a lithium ion battery electrode

技术领域 FIELD

[0001] 本发明涉及一种锂离子电池电极。 [0001] The present invention relates to a lithium ion battery electrode.

背景技术 Background technique

[0002] 现有的锂离子电池可分为卷绕式及层叠式两类,其包括外壳体、封装于外壳体内的正极片、负极片、隔膜及电解液。 [0002] The conventional lithium ion battery can be classified into two types of wound and laminated, comprising a housing body, the housing body of the package positive electrode sheet, negative electrode sheet, a separator and an electrolyte. 该隔膜设置于正极片与负极片之间。 The separator disposed between the positive electrode sheet and negative electrode sheet. 该电解液充分浸润正极片、负极片及隔膜。 The electrolyte solution fully wet the positive electrode sheet, negative electrode sheet and the separator. 所述正极片包括一正极集流体及形成于该正极集流体表面的正极材料层。 The positive electrode sheet comprising a positive electrode current collector and a cathode material layer formed on the surface of the cathode current collector. 所述负极片包括一负极集流体及形成于该负极集流体表面的负极材料层。 The anode includes an anode current collector and a negative electrode material layer is formed on the surface of the negative electrode current collector.

[0003] 电池中的集流体是用于汇集电流的结构。 [0003] The battery current collector is a current collecting structure. 集流体的功用主要是将电池活性物质产生的电流汇集起来以便形成较大的电流对外输出,因此集流体应与活性物质充分接触,并且内阻应尽可能小为佳。 The main function of collector current of the battery active material is produced pooled to form a larger external output current, so the current collector should be sufficient contact with the active material, and better resistance as small as possible. 现有的锂离子电池的电极片中,集流体通常采用金属薄片,如铜箱、铝箱。 Electrode sheet conventional lithium ion battery, usually a metal foil current collector, such as copper box, Aluminum. 然而,这些金属薄片一般具有较大的重量,因此,采用金属薄片作为集流体制备出的锂离子电池电极在重量一定的情况下,能量密度较小。 However, these metallic flakes typically have a greater weight, and therefore, lithium ion battery electrode was prepared as a metal foil current collector under certain circumstances by weight, smaller energy density.

发明内容 SUMMARY

[0004] 有鉴于此,确有必要提供一种具有较大能量密度的锂离子电池电极的制备方法。 [0004] In view of this, necessary to provide a method of an electrode for a lithium ion battery having a large energy density.

[0005] -种锂离子电池电极的制备方法,该方法包括以下步骤:提供一支撑体,该支撑体具有一第一表面;提供至少一石墨烯膜,该石墨烯膜设置或形成于所述支撑体的第一表面; 以及,在所述石墨烯膜的表面设置一电极材料层。 [0005] - method of producing an electrode of a lithium ion battery, the method comprising the steps of: providing a support member, the support member having a first surface; providing at least one graphene layer, the graphene film disposed or formed on the a first surface of the support; and an electrode material layer provided on a surface of the graphene film.

[0006] 相较于现有技术,本发明所提供的锂离子电池电极的制备方法所制备出的锂离子电池电极的集流体由石墨烯膜和支撑体组成,石墨烯膜的密度较小,因此,集流体的重量较小,同时,由于石墨烯的化学稳定性高,不易被腐蚀,因此,集流体不易被破坏,所以,使用该集流体的锂离子电池具有较高的能量密度和较长的使用寿命。 [0006] Compared to the prior art, the current collector of the lithium ion battery electrode production method of a lithium ion battery electrode of the present invention is provided by the prepared graphene film composition and the support, less dense graphene film, Therefore, the smaller the weight of the current collector, at the same time, due to the high chemical stability of graphene, less susceptible to corrosion, and therefore, the current collector can not easily be damaged, so that the current collector using a lithium ion battery having high energy density and more long service life.

附图说明 BRIEF DESCRIPTION

[0007] 图1为本发明施例提供的锂离子电池电极的侧面示意图。 Side of the lithium ion battery electrode provided in a schematic view [0007] FIG. 1 of the present invention is applied.

[0008] 图2为本发明实施例提供的锂离子电池电极的制备方法的流程图。 [0008] FIG 2 is a flowchart of the method for preparing a lithium ion battery electrode according to an embodiment of the present invention.

[0009] 图3为图1中的电极材料层的结构示意图。 [0009] FIG. 3 is a schematic structural material layer in the electrode 1 of FIG.

[0010] 图4为图1中的电极材料层的扫描电镜照片。 [0010] FIG. 4 is a scanning electron micrograph of the material layer in the electrode of FIG.

[0011] 主要元件符号说明 [0011] Main reference numerals DESCRIPTION

[0012] [0012]

Figure CN103545485BD00031

Figure CN103545485BD00041

[0013] 如下具体实施方式将结合上述附图进一步说明本发明。 [0013] The following specific embodiments in conjunction with the accompanying drawings, the present invention is described.

具体实施方式 Detailed ways

[0014] 请参阅图1,本发明实施例提供一种锂离子电池电极10。 [0014] Referring to FIG. 1, an embodiment of a lithium ion battery electrode 10 of the present invention. 该电极10包括一集流体12 及一电极材料层144。 The electrode 10 includes a current collector 12 and an electrode material layer 144. 该电极材料层144与该集流体12层叠设置。 The electrode material layer 144 is provided with the laminate 12 and the current collector. 该电极材料层144和集流体12是两个单独的层状结构。 Material layer 144 and the collector electrode 12 are two separate layers. 所述集流体12包括一支撑结构12a及一石墨烯膜12b,所述石墨烯膜12b设置于该支撑结构12a的表面。 The current collector 12 comprises a support structure 12a and a graphene film 12b, the graphene film 12b disposed on the surface 12a of the support structure. 所述石墨烯膜12b位于电极材料层144和支撑结构12a之间,与该电极材料层144贴合设置。 The graphene film 12b located between the electrode material layer 144 and the supporting structure 12a, and the electrode material layer 144 is provided attached.

[0015] 请参见图2,本发明提供一种上述锂离子电池电极的制备方法,该方法包括以下步骤: [0015] Referring to FIG. 2, the present invention provides a method for preparing the above-described lithium ion battery electrode, the method comprising the steps of:

[0016] S1:提供一支撑结构12a,该支撑结构12a具有一表面; [0016] S1: providing a support structure 12a, 12a of the support structure having a surface;

[0017] S2:提供至少一石墨烯膜12b,该石墨烯膜12b设置或形成于所述支撑结构12a的表面;以及, [0017] S2: providing at least one graphene film 12b, 12b of the graphene film or surface 12a formed on the supporting structure; and,

[0018] S3:在所述石墨烯膜12b的表面设置一电极材料层144,使该石墨烯膜12b位于该电极材料层144和支撑结构12a之间。 [0018] S3: Set the electrode material layer 144 on a surface of the graphene film 12b, so that the graphene film material layer 12b is positioned between the support structure 144 and the electrode 12a.

[0019] 在步骤S1中,所述支撑结构12a用于支撑石墨烯膜12b。 [0019] In step S1, the support structure 12a for supporting the graphene film 12b. 该支撑结构12a的材料为密度较小且具有较强抗腐蚀能力的材料,如高分子材料、陶瓷或玻璃。 The support structure 12a of the material is less dense and has a strong anti-corrosion material, such as polymer material, ceramic or glass. 所述支撑结构12a可以为一层状结构,所述支撑结构12a的厚度优选为1微米至1毫米。 The support structure 12a may be a layered structure, the support structure 12a is preferably a thickness of 1 micrometer to 1 millimeter.

[0020] 在步骤S2中,所述石墨烯膜12b为一个二维结构的具有一定面积的膜结构。 [0020] In step S2, the graphene film 12b is a film structure having an area of ​​a two-dimensional structure. 该石墨稀膜12b的厚度为10纳米至10微米。 The thickness of the graphene film 12b is 10 nm to 10 microns. 该石墨稀膜12b包括至少一层石墨稀。 The graphene film 12b includes at least one graphene. 当石墨稀膜12b包括多层石墨烯时,该多层石墨烯可以相互搭接形成石墨烯膜12b,以使石墨烯膜12b具有更大的面积;或者该多层石墨烯可以相互叠加形成石墨烯膜12b,以使石墨烯膜12b的厚度增加。 When the multi-layered graphene film 12b comprising graphene, the multilayer graphene may overlap each other forming a graphene film 12b, so that the graphene film 12b has a larger area; or the superposition of multilayer graphene may be formed of graphite alkenyl film 12b, so that the thickness of the graphene film 12b is increased. 优选地,该石墨稀膜12b为一单层石墨稀。 Preferably, the graphene film 12b as a monolayer graphene. 所述石墨稀为由多个碳原子通过sp 2键杂化构成的单层的二维平面结构。 The graphene structure by a plurality of two-dimensional single layer of carbon atoms by sp 2 hybridized bonds constituted. 该石墨烯的厚度可以为单层碳原子的厚度。 The thickness of the graphene may be a single layer of carbon atoms in thickness. 所述石墨烯膜12b为一自支撑结构,所述自支撑为石墨烯膜12b不需要大面积的载体支撑,而只要相对两边提供支撑力即能整体上悬空而保持自身膜状状态,即将该石墨烯膜12b置于(或固定于)间隔一固定距离设置的两个支撑体上时,位于两个支撑体之间的石墨烯膜12b能够悬空保持自身膜状状态。 The graphene film 12b as a self-supporting structure, the self-supporting support is not supporting a large-area graphene film 12b, and the opposite sides of the supporting force as long as a whole is able to maintain its film-like state while floating, i.e. the graphene film 12b is placed (or fixed) on the two supports spaced a fixed distance is provided, a graphene film 12b located between the two supports can be suspended by a film-like state.

[0021] 所述石墨烯膜12b的制备方法可以为化学气相沉积法、机械加压法、LB法、溶液法或采用胶带从定向石墨上撕取等方法。 The [0021] method of preparing a graphene film 12b may be a chemical vapor deposition method, a mechanical pressure, LB technique, or a solution method using a graphite tape from the orientation of the tear-off or the like.

[0022] 本实施例仅以机械加压法为例详细说明所述石墨烯膜12b的制备过程。 Preparation process of the graphene film 12b [0022] Example of the present embodiment only the mechanical pressing method described in detail. 具体地,所述石墨烯膜12b采用机械加压法制备,具体包括以下步骤: In particular, the graphene film 12b prepared by mechanical pressing, comprises the steps of:

[0023] (1)用氧等离子体处理所述支撑结构12a的表面,使之带有氧化层。 [0023] (1) treating the surface of the support structure 12a with oxygen plasma, so that with an oxide layer.

[0024] (2)提供一块状高定向热解石墨,将该高定向热解石墨切出平整表面并出现干净的解理面,将得到的带解理面的高定向热解石墨块放到所述支撑结构12a的表面的氧化层上。 [0024] (2) providing a highly oriented pyrolytic graphite block, the highly oriented pyrolytic graphite planar surface and cut clean cleavage plane appear, and the resulting highly oriented pyrolytic graphite block with a cleavage plane of the discharge onto the surface of the oxide layer 12a of the support structure.

[0025] (3)将处理好的带有解理面的高定向热解石墨连同所述支撑结构12a-起置于一夹具中,然后将所述夹具放入加压装置中,并对该夹具施加压力,所述压力为100牛至200 牛,施压时间为5分钟至10分钟,然后,释放压力,除去块状高定向热解石墨,取出所述支撑结构12a,在所述支撑结构12a的表面氧化层上形成石墨烯膜12b。 Highly oriented pyrolytic graphite [0025] (3) sends the processed together with the cleavage plane of the support structure from 12a- placed in a fixture, the fixture is then placed in the press unit, and the clip applying pressure, the pressure is 100 to 200 bovine cattle, pressing time of 5 minutes to 10 minutes, then releasing the pressure to remove the bulk of highly oriented pyrolytic graphite, removing the support structure 12a, the support structure graphene film 12b is formed on the surface of oxide layer 12a. 上述过程均在超净室中进行。 The above process were carried out in a clean room. 所述夹具具有平整光滑的表面,该表面与所述支撑结构12a、所述块状高定向热解石墨紧密接触。 The clamp having a smooth surface, the surface of the support structure 12a, the close contact with highly oriented pyrolytic graphite block. 采用上述方法所制备的石墨烯膜12b为单层石墨烯。 The above method of preparing a graphene film 12b is a single layer of graphene.

[0026] 所述将胶带上的石墨烯膜12b设置于所述支撑结构12a的表面上时,所述胶带上的石墨烯膜12b通过与所述支撑结构12a的表面之间更大的范德华力转移到所述支撑结构12a 的表面上,即,所述石墨烯膜12b与所述支撑结构12a的表面之间的范德华力大于所述石墨烯膜12b与胶带之间的范德华力。 When [0026] the graphene film tape 12b provided on the surface of the support structure 12a, 12b graphene film on the surface of the tape passes between the support structure 12a with a larger van der Waals forces the support structure is transferred to the surface 12a, i.e., the van der Waals force between the graphene film 12b of the support structure surface 12a is greater than the van der Waals force between the graphene film 12b and adhesive tape.

[0027] 在步骤S3中,当,电极材料层144可以主要由电极活性物质、导电剂及粘结剂均匀混和而成,电极材料层144可以通过涂覆含有电极活性物质、导电剂和粘结剂的浆料于石墨烯膜12b的表面。 [0027] In step S3, when the electrode material layer 144 may be primarily a mixture of an electrode active material, a conductive agent and a binder made uniform, the electrode material layer 144 by coating an electrode active material, conductive agent and a binder agent to the slurry surface graphene film 12b. 在另一实施例中,电极材料层144也可以由电极活性物质及碳纳米管组成, 即,电极材料层144仅包括电极活性物质和碳纳米管。 Embodiment, the electrode material layer 144 may be an electrode active material and carbon nanotubes, i.e., the electrode material layer 144 comprising only the electrode active material and carbon nanotubes another embodiment. 该电极材料层144的制备方法包括以下步骤: The method for preparing the electrode material layer 144 comprising the steps of:

[0028] S31,制备一碳纳米管原料;S32,提供电极活性物质及一溶剂;S33,将该碳纳米管原料和电极活性物质加入至所述溶剂中,并超声分散使该碳纳米管原料和所述电极活性物质相互混合形成一混合物;以及S34,将该混合物从溶剂中分离,干燥该混合物后,形成所述电极材料层。 [0028] S31, the preparation of a carbon nanotube material; S32, to provide an electrode active material and a solvent; S33, addition of the carbon nanotube material and the electrode active material to the solvent, and ultrasonic dispersing the carbon nanotube material and the electrode active substance mixed with each other to form a mixture; and S34, the separation from the solvent mixture, the mixture was dried, the electrode material layer is formed.

[0029] 步骤S31提供的碳纳米管原料的制备方法为:制备一碳纳米管阵列于一基底;将该碳纳米管阵列从该基底上刮下,获得碳纳米管原料。 The method of preparing a carbon nanotube starting material [0029] Step S31 is provided: preparing a carbon nanotube array on a substrate; scraped from the carbon nanotube array on the substrate, the carbon nanotube material is obtained. 优选地,所述碳纳米管阵列为一超顺排碳纳米管阵列。 Preferably, the carbon nanotube array is a super-aligned carbon nanotube array. 该超顺排碳纳米管阵列中的碳纳米管表面纯净,且长度一般大于等于300微米。 The super-aligned carbon nanotube array in the surface of the carbon nanotube purity, generally greater than and a length equal to 300 micrometers. 所述碳纳米管阵列的制备方法不限,可以为化学气相沉积法、电弧放电制备方法或气溶胶制备方法等。 Any method for preparing the carbon nanotube array, and may be a chemical vapor deposition method, arc discharge method for the preparation of an aerosol or other preparation.

[0030] 步骤S32,所述溶剂可以包括乙醇、乙二醇、丙醇、异丙醇、丙酮、N-甲基吡咯烷酮(NMP)及水中的一种或几种。 [0030] step S32, the solvent may comprise one or more alcohol, glycol, propanol, isopropanol, acetone, N- methylpyrrolidone (NMP) and water. 当所述电极10为锂离子电池正极时,该电极活性物质为正极活性物质,可以为锰酸锂、钴酸锂、镍酸锂或磷酸铁锂。 When the electrode 10 is a lithium-ion battery, the electrode active material as a positive electrode active material, lithium cobalt oxide, lithium iron phosphate, lithium nickelate or lithium manganate. 当所述电极1 〇为锂离子电池负极时,该电极活性物质为负极活性物质,所述负极活性物质可以为钛酸锂、氧化硅、纳米硅颗粒及纳米合金中的一种或几种。 When the electrode is a square lithium ion battery anode, the electrode active material of the negative electrode active material, the negative active material may be lithium titanate, silicon oxide, silicon nano-particles and nano alloys of one or more. 本实施例中,该锂离子电池电极10为正极,其电极材料层144的材料为钴酸锂。 In this embodiment, the electrode 10 is a lithium ion battery positive electrode material of the electrode material layer 144 which is a lithium cobaltate.

[0031] 在步骤S33中,所述混合物是指由所述碳纳米管及电极活性物质组成。 [0031] In step S33, the mixture is defined by the carbon nanotubes and the electrode active material composition. 所述碳纳米管原料的质量占混合物总质量的百分比为大于等于0.1%小于等于20%,优选为1%至10%。 Mass of the carbon nanotube starting material accounted for the percentage of the total mass of the mixture is less than or equal to 0.1% to 20%, preferably 1% to 10%. 所述超声的功率为400瓦至1500瓦,优选为800瓦至1000瓦。 The ultrasonic power is 400 watts to 1500 watts, preferably 800 watts to 1000 watts. 该步骤中,需要将所述碳纳米管原料、电极活性物质及溶剂超声震荡2分钟至30分钟以得到由碳纳米管与电极活性物质组成的混合物,优选地该超声震荡的时间为5分钟至10分钟。 In this step, the carbon nanotube mixture is required to obtain a carbon nanotube and an electrode active material consisting of 2 to 30 minutes of raw materials, an electrode active material and a solvent ultrasonic vibration, the ultrasonic vibration is preferably for 5 minutes to 10 minutes. 超声震荡的方式可以为连续超声震汤,也可以脉冲超声震汤。 Ultrasonic vibration of ways to shock to continuous ultrasound can be pulsed ultrasound tremors.

[0032] 步骤S34具体为:在超声震荡形成混合物之后,直接将该混合物和溶剂静置大于1 分钟之后,该混合物沉积至容器的底部,且该混合物上层的溶剂中不含有碳纳米管和电极活性物质。 [0032] Step S34 is specifically: after the ultrasonic vibration to form a mixture, the solvent and the mixture was allowed to stand directly greater than 1 minute, the mixture is deposited to the bottom of the container, and an electrode comprising carbon nanotubes and no upper layer of the solvent mixture active substances. 由于在超声震荡的过程中,碳纳米管原料中的碳纳米管相互缠绕,形成一网络状结构,所述电极活性物质分布在该网络状结构中且被该网络状结构所包覆缠绕,从而使碳纳米管原料和电极活性材料形成一个整体状态的混合物,所以,在静置的过程中,该整体状态的混合物整体下沉至溶剂的底部。 Since during ultrasonic vibration, the raw material of carbon nanotubes in carbon nanotubes entangled with each other to form a network-like structures, the electrode active material distributed in the network-like structure and the wound is covered with a network-like structure, whereby material and the carbon nanotubes form an electrode active material a mixture of the whole state, so in the course of standing, the whole mixture as a whole state of sinking to the bottom of the solvent. 可以采用吸管将混合物上层的溶剂从容器中吸出,使混合物和溶剂分离。 Pipette upper layer may be employed solvent mixture sucked out of the container, and the mixture solvent. 待混合物和溶剂分离之后,干燥该混合物,得到所述电极材料层144。 After the mixture to be separated and a solvent, the mixture was dried to obtain the electrode material layer 144. 可以理解,干燥混合物之后,可以进一步将该混合物冲压后,再按照预定尺寸裁剪形成电极材料层144。 It will be appreciated, after drying the mixture, the mixture may further after stamping, the electrode material layer 144 is formed and then cut directly. 请参见图3及图4,本实施例所制备的电极材料层144仅包括活性物质颗粒144a和碳纳米管144b。 See Figure 3 and Figure 4, the present embodiment the electrode material layer prepared in Example 144 only the active material particles comprising carbon nanotubes 144a and 144b. 大部分电极活性物质颗粒144a附着在碳纳米管144b的表面或者被碳纳米管144b缠绕。 Most of the electrode active material particles adhered to the wound surface 144a or 144b nanotube is a carbon nanotube 144b. 由于碳纳米管144b组成的网络结构为一多孔的结构,大部分电极活性物质颗粒144a颗粒被该网络结构所包围和固定。 Since the network structure of carbon nanotubes 144b is composed of a porous structure, most of the particles of the electrode active material particles 144a and surrounded by the net structure. 碳纳米管144b在作为导电剂的同时,可以起到固定电极活性物质颗粒144a的作用,因此,该锂离子电池材料层144不需要粘结剂。 144b while the carbon nanotubes as a conductive agent, may act as an electrode active material particles 144a is fixed, and therefore, the lithium ion battery 144 does not require an adhesive material layer. 本实施例所提供的电极材料层具有更强的导电性能和更优的高倍率下的充放电性能。 The electrode material layer is provided in the present embodiment has more embodiment conductivity and charge-discharge characteristics at high magnification better. 进一步地,电极材料层144中不包括粘结剂的重量,在电极材料层144的总重量相同的情况下,电极活性物质的重量相对于传统的锂离子电池电极可以提高10%以上,因此,该电极材料层144的比容量较大。 Further, the electrode material layer 144 does not include the weight of the binder, at the same total weight of the electrode material layer 144, the weight of the electrode active material with respect to the conventional lithium ion battery electrode may be increased by 10%, therefore, the specific capacity of the electrode material layer 144 is large. 且,由于粘结剂一般为有机物,对环境有污染,本发明的锂离子电池电极材料层144 无需有机粘结剂,更加环保。 And, since the organic binder is typically, environmental pollution, a lithium ion battery electrode material layer 144 according to the present invention without organic binder, more environmentally friendly.

[0033] 在电极材料层144形成之后,将该电极材料层144设置于石墨烯膜12b的表面,使该石墨烯膜12b位于电极材料层144和支撑结构12a之间,从而形成该锂离子电池电极。 [0033] After forming the electrode material layer 144, the electrode material layer 144 is provided on the surface of the graphene film 12b, so that the graphene film 12b located between the electrode material layer 144 and the support structure 12a, thereby forming a lithium ion battery electrode. 该电极材料层144可以石墨稀膜12b自身的粘性固定在石墨稀膜12b的表面,也可以通过粘结剂固定在石墨稀膜12b的表面。 The electrode material layer 144 may be fixed to the surface itself tacky graphene film 12b is also fixed by the surface of the adhesive film 12b of graphene graphene film 12b.

[0034] 本发明实施例所提供的锂离子电池电极制备方法所制备的锂离子电池电极的集流体由石墨烯膜和支撑体组成,石墨烯膜的密度较小,因此,集流体的重量较小,同时,由于石墨烯的化学稳定性高,不易被腐蚀,因此,集流体不易被破坏,所以,使用该集流体的锂离子电池具有较高的能量密度和较长的使用寿命。 [0034] The collector electrode of a lithium ion battery electrode of a lithium ion battery production method embodiment provided by the embodiment of the present invention prepared by a graphene film composition and the support, less dense graphene film, therefore, than the weight of the current collector small, while, due to the high chemical stability of graphene, easy corrosion, and therefore, the current collector can not easily be damaged, so that the current collector using a lithium ion battery having high energy density and long life. 本发明实施例提供的锂离子电池的电极的制备方法操作简单,成本较低,而且还有利于工业化生产。 The method of preparing a lithium ion battery electrode according to an embodiment of the present invention, simple operation, low cost, but also industrially advantageous.

[0035] 另外,本领域技术人员还可在本发明精神内做其它变化,当然,这些依据本发明精神所做的变化,都应包含在本发明所要求保护的范围之内。 [0035] Additionally, one skilled in the art may make other variations within the spirit of the present invention, of course, vary depending on the spirit of the present invention is made, according to the present invention is intended to be included within the scope of the claims.

Claims (7)

1. 一种锂离子电池电极的制备方法,其包括以下步骤: 提供一支撑结构,该支撑结构具有一表面; 提供至少一石墨烯膜,该石墨烯膜设置于所述支撑结构的表面;以及, 制备一碳纳米管原料,提供电极活性物质及一溶剂,将该碳纳米管原料和电极活性物质加入至所述溶剂中,并超声分散使该碳纳米管原料和所述电极活性物质相互混合形成一混合物,将该混合物从溶剂中分离,干燥该混合物后,形成电极材料层; 将所述电极材料层直接设置在所述石墨烯膜的表面,使该石墨烯膜位于该电极材料层和支撑结构之间。 1. A method of preparing a lithium ion battery electrode, comprising the steps of: providing a support structure, the support structure having a surface; providing at least a graphene film, to the surface of the support structure is provided graphene film; and , a prepared carbon nanotube materials to provide an electrode active material and a solvent, and the starting material added to the electrode active material of carbon nanotubes to the solvent, and ultrasonic dispersing the carbon nanotube material and the electrode active materials are mixed with each other forming a mixture, and the mixture was separated from the solvent, after which the mixture was dried to form an electrode material layer; the electrode material layer is disposed directly on a surface of the graphene film, so that the graphene film of the electrode material layer and is located between the support structure.
2. 如权利要求1所述的锂离子电池电极的制备方法,其特征在于,所述石墨烯膜的制备方法为化学气相沉积法、机械加压法、LB法、溶液法或采用胶带从定向石墨上撕取的方法。 2. A method for preparing a lithium ion battery electrode according to claim 1, characterized in that the method of preparing a graphene film is a chemical vapor deposition method, a mechanical pressure, LB technique, or a method using a solution from the directional tape the method of the graphite torn off.
3. 如权利要求1所述的锂离子电池电极的制备方法,其特征在于,所述石墨烯膜形成于该支撑结构的表面,具体包括以下步骤: 用氧等离子体处理所述支撑结构的表面,在支撑结构的表面形成一氧化层; 提供一块状高定向热解石墨,将该高定向热解石墨切出平整表面并出现干净的解理面,将得到的带解理面的高定向热解石墨块放到所述支撑结构的表面的氧化层上; 将处理好的带有解理面的高定向热解石墨连同所述支撑结构一起置于一夹具中,然后将所述夹具放入加压装置中,并对该夹具施加压力; 释放压力,除去块状高定向热解石墨,取出所述支撑结构,在所述支撑结构的表面氧化层上形成石墨烯膜。 3. A method of preparing a lithium ion battery electrode according to claim 1, wherein the graphene film is formed on the surface of the support structure, includes the following steps: a surface with an oxygen plasma treatment of the support structure forming an oxide layer on the surface of the support structure; providing a highly oriented pyrolytic graphite block, the highly oriented pyrolytic graphite planar surface and a clean cut cleavage planes appear, highly oriented with the cleavage plane of the obtained blocks of pyrolytic graphite onto the surface of the oxide layer of the support structure; good processing cleavage plane with highly oriented pyrolytic graphite together with said supporting structure brought together in a fixture, the fixture is then put the press device, and applying pressure to the clip; the pressure was released, to remove the bulk of highly oriented pyrolytic graphite, removing the support structure, the graphene oxide film is formed on a surface layer of the support structure.
4. 如权利要求3所述的锂离子电池电极的制备方法,其特征在于,所述压力为100牛至200牛,施压时间为5分钟至10分钟。 4. A method of preparing a lithium ion battery electrode according to claim 3, wherein the pressure is from 100 N to 200 cattle, pressing time of 5 minutes to 10 minutes.
5. 如权利要求3所述的锂离子电池电极的制备方法,其特征在于,所述石墨烯膜为单层石墨烯。 5. A method of preparing a lithium ion battery electrode according to claim 3, wherein the graphene film is a single-layer graphene.
6. 如权利要求1所述的锂离子电池电极的制备方法,其特征在于,所述制备所述碳纳米管原料的步骤包括: 提供碳纳米管阵列,该碳纳米管阵列形成于一基底;以及将所述碳纳米管阵列从基底上刮下获得所述碳纳米管原料。 6. A method of preparing a lithium ion battery electrode according to claim 1, wherein said step of preparing the carbon nanotube starting materials comprising: providing an array of carbon nanotubes, the carbon nanotube array formed on a substrate; the array of carbon nanotubes and the carbon nanotubes obtained were scraped from the substrate material.
7. 如权利要求1所述的锂离子电池电极的制备方法,其特征在于,所述超声分散的方式为连续超声震荡或脉冲超声震荡。 7. A method of preparing a lithium ion battery electrode according to claim 1, characterized in that the ultrasonic dispersion of ultrasonic vibration mode is continuous or pulsed ultrasonic vibration.
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